tirar piedras contra el propio tejado

Language: es

1.
All Spanish-speaking regionsneutral
- To throw stones at one's own roof; literally, to hurl stones toward the roof of one's house.
2.
All Spanish-speaking regionscolloquialproverbial
- To act in a way that harms one's own interests; to be self-defeating or to damage oneself through one's actions.

Examples:

ES: Sé que no es bueno tirar piedras contra el propio tejado, pero ése es un paranoico.
EN: I know people in glass houses shouldn't throw stones, Blah, blah, blah, but that guy is paranoid.

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Sourced from Wiktionary